
On the actual weapon, retracting the stock blocks the trigger from being squeezed.
Just like in Escape from Tarkov, the TOZ-106 bolt-action shotgun can be fired even with the stock in the folded position. The original M4A1 could do this but it required some tricky scripting and it confused new players. ArmaLite-pattern rifles do not require the forward assist if you ride the slide forward instead of letting it slam into battery. Even weapons notorious for jamming such as the emergency STANAG magazine well on the M249 will work without fail.
Weapons will never jam, break, or fail to cycle outside of specific circumstances (like low-pressure 12 gauge shells being fired in a semi-automatic shotgun, giving the SPAS-12's dual-mode ability a purpose).
Acceptable Breaks from Reality: Anton simplifies some mechanics for weapons or in general as players who don't have as much knowledge about firearms might not understand several nuances and think the game is bugged.